Question

Calculate the molecular masses of H2,O2,Cl2,Co2,CH4,C2H6,C2H4,NH3,CH3OH.​

Answer 1

Explanation:

Molecular mass of H2 = 2 X atomic mass of H = 2 X 1u = 2u

Molecular mass of O2 = 2 Xatomic mass of O = 2 X 16u = 32u

Molecular mass of Cl2 = 2 X atomic mass of Cl = 2 X 35.5u = 71u

Molecular mass of CO2 = atomic mass of C + 2 X atomic mass of O

= 12+ (2+16) = (12 + 32)u = 44u

Molecular mass of CH4 = atomic mass of C+ 4 X atomic mass of H

= 12+ (4X1)u = (12 + 4)u = 16u

Molecular mass of C2H6 = 2 X atomic mass of C + 6 X atomic mass of H

= (2 X 12 + 6 X 1)u = (24 + 6)u = 30u

Molecular mass of C2H4 = 2 X atomic mass of C+ 4 X atomic mass of H

= (2 X 12 + 4 X 1)u = (24 + 4)u = 28u

Molecular mass of NH3 = atomic mass of N + 3 X atomic mass of H

= (14 + 3 X 1)u = (14 + 3)u = 17u

Molecular mass of CH3OH = atomic mass of C + 3 x atomic mass of H + atomic mass of O

+ atomic mass of H

= (12 + 3 X 1 + 16 + 1)u = (12 + 3 + 17)u = 32u

hope it works

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